Hi there Andy.
Great question.
We all have a different point of view I am sure, but to my way of thinking the Costa del Sol was always the best weather wise. However during the boom years (property wise) over the 90’s and right up until last year – it became so crowded with people buying up new build, renting it out, selling it on and generally moving out there on a permanent basis that it turned into a seething mass of all nationalities and their cars !!!!!! The traffic is now appalling.
The Costa Blanca, I have always thought of as a sort of Blackpool with sun – great for ex-pats who like to live with other Brits, same lifestyle as in the U.K. but better weather. Also very crowded though!
Now the Costa de la Luz (where I am living) was where I started out many years ago.
This is an area which is still very open and very Spanish – yes the British and other northern Europeans are moving out here slowly but surely, but here the authorities are not making the same mistakes as they did on the Blanca and the Sol.
Here the property is still built in the attractive Andaluz style, buildings are not ‘high-rise’, the beaches are still ‘virgin’ and not covered with rented beds and umbrellas, the weather is good and the price of food and drinks is still reasonable.
Having said all that – the property is not cheap, but you can’t have everything so they say.

Well, there you have it – for me it’s the Costa de la Luz.
Would anyone like to argue the point?